Speedup and buffer division in input/output queueing ATM switches

The capacity of a switch is built out of two factors: space parallelism and speedup. A switch has space parallelism if more than one input port can transmit at any point of time. Speedup is defined to be the speed ratio of the speed of the switch´s internal link over that of the incoming link. To build a switch of the same capacity, we can use less space parallelism (the space factor) but more speedup (the time factor), or vice versa. This paper studies how the different (space, time) implementations affect the optimum buffer division between the input and the output queues